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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details) $ in Thousands	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value	$ 5,893	$ 6,488	$ 17,392	$ 17,967	$ 13,502	$ 2,223
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans held for investment	5,207		7,108
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	2,550		2,710
Fair value of loans held for investment	5,207		7,108
Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value	$ 5,893		$ 17,392
Implied spread to benchmark interest rate curve | Minimum | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, fair value inputs	0.0200		0.0200
Loans held for investment, fair vale inputs	0.0334		0.0396
Implied spread to benchmark interest rate curve | Maximum | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, fair value inputs	0.0200		0.0200
Loans held for investment, fair vale inputs	0.1088		0.1064
Implied spread to benchmark interest rate curve | Weighted average | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, fair value inputs	0.0200		0.0200
Loans held for investment, fair vale inputs	0.0544		0.0623
Fall-out factor | Minimum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0100		0.0197
Fall-out factor | Maximum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.2576		0.3838
Fall-out factor | Weighted average | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.1246		0.1553
Value of servicing | Minimum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0036		0.0041
Value of servicing | Maximum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0146		0.0144
Value of servicing | Weighted average | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0109		0.0097

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